Jared James Abrahams, a 19-year-old Southern California computer student, is facing federal prison for hacking the webcam of Miss Teen USA Cassidy Wolf.
Wolf and a dozen other young women worldwide were hacked and blackmailed with the threat of going public with naked pictured he secretly took.
Abrahams pleaded guilty to four counts of extortion and one count of unauthorized access of a computer. He will serve 27-33 months in federal prison.
Court records show that his victims, which included some minors, were located in Southern California, Maryland, Ireland, Canada, Russia and Moldova.
The plot lasted from early 2012 until June 2013.
Cassidy Wolf was the most famous, given her high profile, but Abrahams threatened to post the illegally obtained photos of at least 12 others as well.
If his targets did not send him more nude images or strip for him on camera, he said he would out them. At least two complied with his demands.
"I hacked [the] girls' computers and, using webcams, took photos of them when they weren't aware," Abrahams said in court, admitting his misdeeds.
Jared James Abrahams knew some of his victims, including Wolf, a high school classmate. She exposed the "sextortion" plot earlier this year.
Wolf, who was crowned in August, went public when she received an e-mail containing nude pics of her that were taken by the camera on her laptop.
"Here's what's going to happen!" the e-mailer wrote. "Either you do one of the things listed below or I upload these pics and a lot more … on all your accounts."
"Your dream of being a model will be transformed into a pornstar," he threatened.
The FBI raided Abrahams' home in June and arrested him in September.
Wolf tweeted, "Happy to know that this nightmare is coming to an end."